Field-Induced Carrier Delocalization in the Strain-Induced Mott Insulating State of an Organic Superconductor

Kawasugi, Yoshitaka; Yamamoto, Hiroshi; Tajima, Naoya; Fukunaga, Tomohiro; Tsukagoshi, Kazuhito; Kato, Reìzo

doi:10.1103/physrevlett.103.116801

Cited by 49 publications

(37 citation statements)

References 21 publications

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“…Different from the nearly-free electrons, the bands of correlated electrons are not strictly rigid but somewhat "soft" [13][14][15] , which may lead to emergent phenomena beyond the simple band theory. In this work, the (YFeO 3 ) n /(YTiO 3 ) n superlattices have been studied using the density functional theory (DFT).…”

Section: Introductionmentioning

confidence: 99%

Charge transfer and hybrid ferroelectricity in(YFeO3)n/(YTiO3)nmagnetic superlattices

et al. 2015

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Interfaces in oxide heterostructures always provide a fertile ground for emergent properties. Charge transfer from a high energy band to a low energy opponent is naturally expected, as occurring in semiconductor p-n junctions. In this study, several exceptional physical phenomena have been predicted in (YFeO3)n/(YTiO3)n superlattices. First, the charge transfer between these Mott insulators is in opposite to the intuitive band alignment scenario. Second, hybrid ferroelectricity with a moderate polarization is generated in the n = 2 magnetic superlattice. Furthermore, the ferroelectric-type distortion can persist even if the (ABO3)2/(AB'O3)2 system turns to be metallic, rending possible metallic ferroelectricity.

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Section: Introductionmentioning

confidence: 99%

Charge transfer and hybrid ferroelectricity in(YFeO3)n/(YTiO3)nmagnetic superlattices

et al. 2015

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“…(2). Finally, the fitting is square-rooted in order to compare with the linear spectrum obtained by the re-flectivity.…”

Section: Resultsmentioning

confidence: 99%

“…Some of the Mott insulating single crystals show the phase transition to metal or to superconducting phases by changing temperature and/or pressure [1], by applying electric field [2], by electric current [3], or by photo-irradiation [4]. To make these molecular crystals work as (photo-switchable) memory devices, the electric conductivity at the surface has to be controlled, like semiconductor-based devices.…”

Section: Introductionmentioning

confidence: 99%

“…Since SFG is based on the second order non-linear optical susceptibility (χ (2) ), no signal will be obtained from materials with inversion symmetry. Even for such materials, however, the symmetry is broken at the surface and χ (2) becomes non-zero [6]. To detect such weak signals without damaging the surface structures, the pulse laser with a high repetition rate and moderate intensity was used.…”

Section: Introductionmentioning

confidence: 99%

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Photo-Induced Structural Changes at a Surface οf Organic Single Crystals Observed by Vibrational Sum Frequency Generation Spectroscopy

et al. 2012

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Phase transitions from insulator to metal induced by thermal excitation and by photo-irradiation at the surface of β -(BEDT-TTF)(TCNQ) are investigated using vibrational sum frequency generation spectroscopy. The results are compared with linear reflectivity measurements which detect the information mainly from bulk. IR absorption spectra of a g vibrational modes of TCNQ induced by the dimerization are observed using vibrational sum frequency generation spectroscopy, and its intensity is found to become smaller by thermal excitation indicating the transition to the metal phase. Time-dependent degree of dimerization is also observed by pump-probe experiments with almost the same statistics as the static measurements. On the other hand, in the reflectivity experiments, the reduction of dimerization is also observed by elevating the temperature, however, the spectral shapes are deformed for the time-resolved measurements. These results imply that the different dynamics occur at the surface and in the bulk.

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“…[14][15][16] In this study, we performed carrier doping of the organic Mott insulator complex ET-F 2 TCNQ (ET ¼ bis(ethylenedithio)tetrathiafulvalene, F 2 TCNQ ¼ 2,5-difluoro-7,7,8,8-tetracyanoquinodimethane) crystal surface by contact with TTF. Enhanced conductivity was observed, and the surface was subjected to atomic force microscopy (AFM) and Raman measurements.…”

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confidence: 99%

Carrier doping to the organic Mott insulator by conjugating with tetrathiafulvalene

Takahashi

Nakagawa

Hayakawa

et al. 2012

Applied Physics Letters

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The electrical conductivity of the organic Mott insulator ET-F2TCNQ (ET = bis(ethylenedithio)tetrathiafulvalene, F2TCNQ = 2,5-difluoro-7,7,8,8-tetracyanoquinodimethane) crystal was found to be enhanced by conjugation with a tetrathiafulvalene (TTF) single crystal on its surface; surface sheet resistance decreased from 5 × l05 to 2 × 103 Ω/sq. The mechanism of this decrement was investigated through optical and atomic force microscopy measurements at the interface. When TTF was conjugated to the ET-F2TCNQ crystal, electron injection from TTF and complex formation between TTF and F2TCNQ occurred. Neutral ET molecules were consequently generated at the interface, and this charge doping broke the Mott insulating state.

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Field-Induced Carrier Delocalization in the Strain-Induced Mott Insulating State of an Organic Superconductor

Cited by 49 publications

References 21 publications

Charge transfer and hybrid ferroelectricity in(YFeO3)n/(YTiO3)nmagnetic superlattices

Charge transfer and hybrid ferroelectricity in(YFeO3)n/(YTiO3)nmagnetic superlattices

Photo-Induced Structural Changes at a Surface οf Organic Single Crystals Observed by Vibrational Sum Frequency Generation Spectroscopy

Carrier doping to the organic Mott insulator by conjugating with tetrathiafulvalene

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